Method for grant free uplink transmission, user equipment and base station device

ABSTRACT

The present disclosure provides a grant free uplink transmission method, the method is performed at a user equipment side, comprising: determining, according to configuration information for grant free uplink transmission received from a base station, a radio network temporary identifier GF-RNTI for grant free uplink transmission, and transmitting an uplink signal; and monitoring feedback from the base station in a downlink control channel by using the determined GF-RNTI. The present disclosure also provides a user equipment and a base station for grant free uplink transmission.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation application of prior application Ser.No. 17/052,959 filed on Nov. 4, 2020, which is a U.S. National Stageapplication under 35 U.S.C. § 371 of an International application numberPCT/KR2019/005119 filed on Apr. 29, 2019, which is based on and claimspriority of a Chinese patent application number 201810444554.9 filed onMay 10, 2018, in the Chinse Intellectual Property Office, of a Chinesepatent application number 201810481214.3, filed on May 18, 2018, in theChinse Intellectual Property Office, and of a Chinese patent applicationnumber 201811642884.5, filed on Dec. 29, 2018, in the ChinseIntellectual Property Office, the entire disclosure of each of which isincorporated by reference herein in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of wireless communicationsystems, and in particular, to a method for grant free uplinktransmission, a user equipment and a base station device.

BACKGROUND ART

With the rapid development of the information industry, especially thegrowing demand from the mobile internet and Internet of Things (IoTs),it brings unprecedented challenges to future mobile communicationtechnologies. According to a report ITU-R M. [IMT.BEYOND 2020.TRAFFIC]of the International Telecommunication Union (ITU), it can be expectedthat by 2020, the growth of mobile traffic will increase by nearly 1000times compared with 2010 (4G era), and user equipment connections willalso exceed 17 billion; with the massive penetration of IoT devices intomobile communication networks, the number of connected devices will beeven more astonishing. In order to cope with this unprecedentedchallenge, the communication industry and academia have launched a widerange of fifth-generation (5G) mobile communication technology researchfor the 2020s. The framework and overall goals of the future 5G havebeen recently discussed in the ITU Report ITU-R M. [IMT.VISION], whichdetails 5G requirement expectations, application scenarios and keyperformance indicators. For the new requirements in 5G, the ITU reportITU-R M[IMT.FUTURE TECHNOLOGY TRENDS] provides information on 5Gtechnology trends, aiming at resolving a significant increase in systemthroughput, user experience consistency, scalability to support IoTs,latency, energy efficiency, cost, network flexibility, emergingservices, flexible spectrum utilization and so on.

Faced with 5G's more diverse service scenarios, flexible multiple accesstechnologies are needed to support different scenarios and servicerequirements. For example, in facing a massively connected servicescenario, how to access more users on a limited resource becomes a coreissue that needs to be solved by 5G multiple access technology. In thecurrent 4G LTE network, the Orthogonal Frequency Division Multiplexing(OFDM) based multiple access technology is mainly used. However, it isobviously difficult for the existing orthogonal-based access method tomeet the requirements for 5G with spectrum efficiency increased by 5˜15times and the number of user access per square kilometer area reachingmillion levels. Non-orthogonal Multiple Access (NoMA) technology reusesthe same resources by multiple users, which greatly increases the numberof supported user connections. As the user has more opportunities toaccess, the overall network throughput and spectrum efficiency areimproved. In addition, in facing massive Machine Type Communication(mMTC) scenarios, it may be necessary to use a multiple accesstechnology that is easier to handle, in consideration of the cost andimplementation complexity of the terminal. Faced with low-latency orlow-power service scenarios, the usage of non-orthogonal multiple accesstechnology can better achieve grant free contention access, achievelow-latency communication, and reduce turn-on time and device powerconsumption.

The non-orthogonal multiple access technology currently under study isMultiple User Shared Access (MUSA), Non-Orthogonal Multiple Access(NOMA), Pattern Division Multiple Access (PDMA), Sparse Code MultipleAccess (SCMA) and Interleave Division Multiple Access (IDMA) and thelike. Among them, MUSA relies on codewords to distinguish users. SCMArelies on codebooks to distinguish users. NOMA distinguishes users bypower. PDMA distinguishes users by different feature patterns, and IDMAdistinguishes users by interleaving sequences.

DISCLOSURE OF INVENTION Technical Problem

When a user (UE, User Equipment) is in the connected state, that is, theUE has accessed the network to obtain the cell-radio network temporaryidentity (C-RNTI) configured by the network device, the user can detectwhether the received downlink control information is for itself or notbased on the C-RNTI. However, when the UE is in the non-connected state,especially when the UE performs the grant free uplink transmission, howto determine the time-frequency resource of the grant free uplinktransmission or using what kind of identifier to check whether thedownlink control channel information belongs to itself is a problem thatneeds to be solved.

Solution to Problem

In view of this, according to an aspect, the present disclosure providesa grant free uplink transmission method performed at a user equipmentside, comprising: determining, according to configuration informationfor grant free uplink transmission received from a base station, a radionetwork temporary identifier GF-RNTI for grant free uplink transmission,and transmitting an uplink signal; and monitoring feedback from the basestation in a downlink control channel by using the determined GF-RNTI.

According to an embodiment of the present disclosure, the method furthercomprises determining first information according to the configurationinformation for grant free uplink transmission received from the basestation, the first information comprising at least one of atime-frequency resource, preamble, a de-modulation reference signalDMRS, or a multiple access signature MAS for grant free uplinktransmission.

According to an embodiment of the present disclosure, the configurationinformation comprises at least one of a grant free uplink transmissiontime-frequency resource set; a mapping relationship between a grant freeuplink transmission time-frequency resource and a downlink beam; and amapping relationship between at least one of a grant free preamble, aDMRS or a multiple access signature resource and a downlink beam; aresource pool of GF-RNTI; a mapping relationship between GF-RNTI and atleast one of a time-frequency resource, a preamble, a DMRS, or amultiple access signature resource for grant free uplink transmission; acontrol resource set for UE to monitor a grant free uplink transmissionfeedback and/or configuration of search space; the maximum number oftransmissions of the grant free uplink transmission; and the maximumtransmission time of the grant free uplink transmission.

According to an embodiment of the present disclosure, determining theGF-RNTI for grant free uplink transmission comprises at least one of:determining, according to the configuration information, a GF-RNTIresource pool, selecting one GF-RNTI from the GF-RNTI resource pool as aGF-RNTI for grant free uplink transmission; determining, according tothe first information, the GF-RNTI for grant free uplink transmission;and when the grant free uplink transmission time-frequency resource isdetermined based on the configured random access time-frequencyresource, calculating the radio network temporary identifier RA-RNTI ona corresponding random access channel as the GF-RNTI.

According to an embodiment of the present disclosure, determining,according to the first information, the GF-RNTI for grant free uplinktransmission comprises at least one of: determining, according to thedetermined first information and a mapping relationship between theGF-RNTI and the first information, the GF-RNTI for grant free uplinktransmission; and calculating the GF-RNTI for grant free uplinktransmission according to the first information.

According to an embodiment of the present disclosure, calculating theGF-RNTI for grant free uplink transmission according to the firstinformation comprises: calculating the GF-RNTI for grant free uplinktransmission according to at least one of an index of a grant freeuplink transmission opportunity (GFO), a time unit index, an orthogonalfrequency division multiplexing (OFDM) symbol index, a subframe index,or a carrier index where the determined grant free uplink transmissiontime-frequency resource is positioned.

According to an embodiment of the present disclosure, determining atleast one of a time-frequency resource, a preamble, a de-modulationreference signal DMRS, or a multiple access signature MAS for grant freeuplink transmission comprises: determining the downlink beam, anddetermining at least one of the time-frequency resource, the preamble,the de-modulation reference signal DMRS, and the multiple accesssignature MAS for grant free uplink transmission according to thedetermined downlink beam and the mapping relationship between thedownlink beam and at least one of the time-frequency resource, thepreamble, the de-modulation reference signal DMRS, and the multipleaccess signature MAS for grant free uplink transmission; and determiningat least one of the time-frequency resource, the preamble, thede-modulation reference signal DMRS, and the multiple access signatureMAS for grant free uplink transmission according to the determinedGF-RNTI and the mapping relationship between the GF-RNTI and at leastone of the time-frequency resource, the preamble, the de-modulationreference signal DMRS, and the multiple access signature MAS for grantfree uplink transmission.

According to an embodiment of the present disclosure, the grant freeuplink transmission time-frequency resource set is determined by atleast one of: determining by an indication of at least one of the numberof time units and a time unit start position, the number of frequencydomain units and a frequency domain unit start position, and atime-frequency resource repetition period; determining by an indicationof an index of the grant free uplink transmission opportunity (GFO); anddetermining by an indication of a relative position to the configuredrandom access time-frequency resource.

According to an embodiment of the present disclosure, the indication ofthe relative position to the configured random access time-frequencyresource comprises: indicating relative position information of thegrant free uplink transmission time-frequency resource to the configuredrandom access time-frequency resource in the frequency domain, relativeposition information in the time domain or relative position informationin the code domain.

According to an embodiment of the present disclosure, indicating therelative position information in the frequency domain comprisesindicating, in the configuration information, a frequency domaininterval size of the grant free uplink transmission time-frequencyresource and the random access resource, and indicating the number ofthe GFOs in the frequency domain; indicating the relative positioninformation in the time domain comprises indicating, in theconfiguration information, a time interval size of the grant free uplinktransmission time-frequency resource and the random access resource, andindicating the number of GFOs in the time domain; and indicating therelative position information in the code domain comprises indicating,in the configuration information, some or all of the random accessresources as the grant free uplink transmission time-frequency resourceand indicating a preamble index or index range used in the grant freeuplink transmission.

According to an embodiment of the present disclosure, indicating therelative position information in the frequency domain is implemented byat least one of: performing frequency division on one random accessopportunity RO and one grant free uplink transmission opportunity GFO,wherein a time-divided preamble and data part are respectivelytransmitted in one GFO; performing frequency division on a plurality oftime-divided random access opportunities ROs and one grant free uplinktransmission opportunity GFO, wherein a time-divided orfrequency-divided preamble and data part are respectively transmitted inone GFO; and performing frequency division on one random accessopportunity RO and one grant free uplink transmission opportunity GFO,wherein a frequency-divided preamble and data part are respectivelytransmitted in one GFO.

According to an embodiment of the present disclosure, indicating therelative position information in the time domain is implemented by atleast one of: performing time division on one random access opportunityRO and one grant free uplink transmission opportunity GFO, wherein atime-divided preamble and data part are respectively transmitted in oneGFO; performing time division on a plurality of frequency-divided randomaccess opportunities ROs and one grant free uplink transmissionopportunity GFO, wherein a time-divided or frequency-divided preambleand data part are respectively transmitted in one GFO; and performingtime division on one random access opportunity RO and one grant freeuplink transmission opportunity GFO, wherein a frequency-dividedpreamble and data part are respectively transmitted in one GFO.

According to an embodiment of the present disclosure, the mappingrelationship between the grant free uplink transmission time-frequencyresource and the downlink beam is obtained by at least one of:configuring a separate mapping relationship between the grant freeuplink transmission time-frequency resource and the downlink beam;reusing the mapping relationship between the random accesstime-frequency resource and the downlink beam; and if the separatemapping relationship between the grant free uplink transmissiontime-frequency resource and the downlink beam is not configured, reusingthe mapping relationship between the random access time-frequencyresource and the downlink beam; otherwise, using the configured separatemapping relationship between the grant free uplink transmissiontime-frequency resource and the downlink beam.

According to an embodiment of the present disclosure, the mappingrelationship between at least one of the grant free preamble, the DMRSor the multiple access signature resource and the downlink beam isobtained by at least one of:

configuring a separate mapping relationship between at least one of thegrant free preamble, the DMRS or the multiple access signature resourceand the downlink beam;

reusing the mapping relationship between the random access preamble andthe downlink beam to obtain a preamble for grant free uplinktransmission, and obtaining the DMRS and the multiple access signatureresource for grant free uplink transmission by the mapping relationshipbetween the preamble for grant free uplink transmission and the DMRS,the multiple access signature resource for grant free uplinktransmission;

reusing the mapping relationship between the random access preamble andthe downlink beam to obtain a preamble for grant free uplinktransmission, and obtaining the DMRS and the multiple access signatureresource for grant free uplink transmission by configuring a separatemapping relationship between the grant free preamble, the DMRS, themultiple access signature resource and the downlink beam; and

if the separate mapping relationship between at least one of the grantfree preamble, the DMRS and the multiple access signature resource andthe downlink beam is not configured, reusing the mapping relationshipbetween the random access preamble and the downlink beam in combinationwith the mapping relationship between the preamble for grant free uplinktransmission and the DMRS and the multiple access signature resource;otherwise, using the configured separate mapping relationship between atleast one of the grant free preamble, the DMRS and the multiple accesssignature resource and the downlink beam.

According to another aspect, the present disclosure further provides agrant free uplink transmission method performed at a base station deviceside, comprising: transmitting, to a user equipment side, configurationinformation for determining a radio network temporary identifier GF-RNTIfor grant free uplink transmission; and detecting user's signaltransmission on the configured grant free uplink transmissiontime-frequency resource, and performing downlink feedback on thesuccessfully detected and decoded signal transmission, wherein theGF-RNTI corresponding to the successfully detected and decoded signaltransmission is used in the downlink feedback.

According to an embodiment of the present disclosure, the configurationinformation comprises at least one of a grant free uplink transmissiontime-frequency resource set; a mapping relationship between a grant freeuplink transmission time-frequency resource and a downlink beam; and amapping relationship between at least one of a grant free preamble, aDMRS or a multiple access signature resource and a downlink beam; aresource pool of GF-RNTI; a mapping relationship between GF-RNTI and atleast one of a time-frequency resource, a preamble, a DMRS, or amultiple access signature resource for grant free uplink transmission; acontrol resource set for UE to monitor a grant free uplink transmissionfeedback and/or configuration of search space; the maximum number oftransmissions of the grant free uplink transmission; and the maximumtransmission time of the grant free uplink transmission.

According to an embodiment of the present disclosure, the configurationinformation is further used to determine at least one of thetime-frequency resource, the preamble, the de-modulation referencesignal DMRS, and the multiple access signature MAS for grant free uplinktransmission.

According to another aspect, the present disclosure further provides auser equipment for grant free uplink transmission, comprising a memoryand a processor, the memory having stored thereon computer executableinstructions that, when executed by the processor, perform any of themethods performed at the user equipment side described in theembodiments of the present disclosure.

According to another aspect, the present disclosure further provides abase station device for grant free uplink transmission, comprising amemory and a processor, the memory having stored thereon computerexecutable instructions that, when executed by the processor, performany of the methods performed at the base station device side describedin the embodiments of the present disclosure.

According to another aspect, the present disclosure further provides acomputer readable medium having stored thereon computer executableinstructions that, when executed, perform any of the methods describedin the embodiments of the present disclosure.

In the present disclosure, the user equipment may determine, by usingconfiguration information of the network device, resource configurationfor grant free uplink transmission, such as an available time-frequencyresource, and/or a preamble, and/or a de-modulation reference signal,and/or a multiple access signature resource; at the same time, the userequipment may also determine a temporary identifier used for monitoringdownlink feedback from the base station device; thereby providing acomplete grant free uplink transmission method for the user equipment.

Advantageous Effects of Invention

According to the present disclosure, a grant free uplink transmissionmethod performed at a user equipment side is provided,

BRIEF DESCRIPTION OF DRAWINGS

The above and other objects, features and advantages of the presentdisclosure will become more apparent from the below description of theembodiments of the present disclosure by reference to the accompanyingdrawings in which:

FIG. 1 is a schematic diagram of a method for grant free uplinktransmission performed at a user equipment side according to anembodiment of the present disclosure;

FIG. 2 is a schematic diagram of a method for grant free uplinktransmission performed at a base station device side according to anembodiment of the present disclosure;

FIG. 3 is a schematic diagram of interaction between a user equipmentand a base station device when performing grant free uplink transmissionaccording to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram showing frequency division of a randomaccess opportunity and a grant free uplink transmission opportunityaccording to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram showing time division of a random accessopportunity and a grant free uplink transmission opportunity accordingto an embodiment of the present disclosure;

FIG. 6 is a diagram showing an example of mapping relationship between agrant free uplink transmission time-frequency resource and a downlinkbeam according to an embodiment of the present disclosure;

FIG. 7 is a block diagram of a user equipment according to an embodimentof the present disclosure;

FIG. 8 is a block diagram of a base station device according to anembodiment of the present disclosure;

FIG. 9 is a schematic diagram of determining an uplink transmissionresource situation according to an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of determining an uplink transmissionresource situation according to another embodiment of the presentdisclosure;

FIG. 11 is a schematic diagram showing partial time-domain sharing of atwo-step random access time-frequency resource according to anembodiment of the present disclosure;

FIG. 12 is a schematic diagram showing partial frequency-domain sharingof a two-step random access time-frequency resource according to anembodiment of the present disclosure;

FIG. 13 is a schematic diagram showing partial time-frequency domainsharing of a two-step random access time-frequency resource according toan embodiment of the present disclosure;

FIG. 14 is a schematic diagram of a method for confirming a two-steprandom access time-frequency resource according to an embodiment of thepresent disclosure; and

FIG. 15 is a schematic diagram of a method for confirming a two-steprandom access time-frequency resource according to an embodiment of thepresent disclosure.

MODE FOR THE INVENTION

Hereinafter, embodiments of the present disclosure will be describedwith reference to the drawings. It should be understood, however, thatthe description is only illustrative, and is not intended to limit thescope of the disclosure. In addition, descriptions of well-knownstructures and techniques are omitted in the following description inorder to avoid unnecessarily obscuring the concept of the presentdisclosure.

It should be understood that the singular forms such as “a”, “an” and“the” as used herein are intended to include plural forms as well,unless specifically indicated. It should be further understood that thephrases such as “comprise”, “comprising”, “include” or “including” asused in the description specify the existence of the statedcharacteristics, integers, steps, operations, elements and/orcomponents, but do not exclude the existence or addition of one or moreother characteristics, integers, steps, operations, elements, componentsand/or groups thereof. It will be understood that when an element isreferred to as being “connected” or “coupled” to another element, it canbe directly connected or coupled to the other element, or there mayexist an intervening element therebetween. Further, “connected” or“coupled” as used herein may include either a wireless connection or awireless coupling. The term “and/or” used herein includes all or any oneof one or more of the associated listed items and all or any combinationthereof.

Those skilled in the art will appreciate that all terms (includingtechnical and scientific terms) used herein have the same meaning ascommonly understood by one of ordinary skill in the art to which theinvention belongs, unless otherwise defined. It should also beunderstood that terms such as those defined in a general dictionaryshould be understood to have meanings consistent with those in thecontext of the prior art, and will not be interpreted in an idealized oroverly formal form unless specifically defined as here.

Those skilled in the art will appreciate that the “terminal” and“terminal device” as used herein include both a wireless signal receiverdevice which has only a wireless signal receiver without transmissioncapability, and a device having receiving and transmitting hardwarewhich is capable of performing two-way communication over a two-waycommunication link. Such devices may include cellular or othercommunication devices having a single line display or a multi-linedisplay or a cellular or other communication device without a multi-linedisplay; PCS (Personal Communications Service), which may combine voice,data processing, fax, and/or data communication capabilities; PDA(Personal Digital Assistant), which may include radio frequencyreceivers, pagers, Internet/Intranet access, web browsers, notepads,calendars, and/or GPS (Global Positioning System) receivers;conventional laptop and/or palmtop computers or other devices havingand/or including a conventional laptop and/or palmtop computer or otherdevice that includes a radio frequency receiver. As used herein,“terminal” and “terminal device” may be portable, transportable,installed in a means of transportation (aviation, sea and/or land), oradapted and/or configured to operate locally, and/or operate on theEarth and/or in any other position of space in a distributed form. The“terminal” and “terminal device” used herein may also be a communicationterminal, an internet terminal, a music/video playing terminal, such asa PDA, a MID (Mobile Internet Device), and/or a mobile phone having amusic/video playback function, or may also be smart TVs, set-top boxesand other devices.

The time unit in the present disclosure may be one OFDM symbol, one OFDMsymbol group (consisting of multiple OFDM symbols), one time slot, onetime slot group (consisting of multiple time slots), one subframe, onesubframe group (consisting of multiple subframes), one system frame, onesystem frame group (consisting of multiple system frames); or may beabsolute time units, such as 1 millisecond, 1 second, etc.; or timeunits may also be a combination of multiple granularities, such as N1time slots plus N2 OFDM symbols.

The frequency domain unit in the present disclosure may be onesubcarrier, one subcarrier group (consisting of multiple subcarriers),and one resource block (RB), which may also be called a physicalresource block (PRB), one resource block group (consisting of multipleRBs), one bandwidth part (BWP), one bandwidth part group (consisting ofmultiple BWPs), one band/carrier, one band group/carrier group; or maybe absolute frequency domain units, such as 1 Hz, 1 kHz, etc.; or thefrequency domain unit may also be a combination of multiplegranularities, such as M1 PRBs plus M2 subcarriers.

In order to make the objects, technical means and advantages of thepresent disclosure more clear, the present application will be furtherdescribed in detail below with reference to the accompanying drawingsand specific embodiments.

FIG. 1 is a schematic diagram of a method 100 for grant free uplinktransmission performed at a user equipment side according to anembodiment of the present disclosure.

The method 100 includes a step S101 of determining, according toconfiguration information for grant free uplink transmission receivedfrom a base station, a grant free radio network temporary identity(GF-RNTI) for grant free uplink transmission, and transmitting an uplinksignal.

In this embodiment, the configuration information for grant free uplinktransmission may include at least one of a grant free uplinktransmission time-frequency resource set; a mapping relationship betweena grant free uplink transmission time-frequency resource and a downlinkbeam; and a mapping relationship between at least one of a grant freepreamble, a de-modulation reference signal (DMRS) or a multiple accesssignature (MAS) resource and a downlink beam; a resource pool ofGF-RNTI; a mapping relationship between GF-RNTI and at least one of atime-frequency resource, a preamble, a DMRS, or a multiple accesssignature resource for grant free uplink transmission; a controlresource set for UE to monitor a grant free uplink transmission feedbackand/or configuration of search space; the maximum number oftransmissions of the grant free uplink transmission; and the maximumtransmission time of the grant free uplink transmission.

In this embodiment, according to the configuration information for grantfree uplink transmission received from the base station, otherconfigurations for the grant free uplink transmission may also bedetermined, including determining at least one of the time-frequencyresource, the preamble, the de-modulation reference signal DMRS and amultiple access signature MAS for grant free uplink transmission.

The method further includes a step S102 of monitoring feedback from thebase station in the downlink control channel by using the determinedGF-RNTI, and performing a further operation according to the content ofthe feedback.

This embodiment provides a method for determining a GF-RNTI, whichfacilitates an idle user to monitor downlink feedback, and also providesa method for determining a grant free uplink transmission time-frequencyresource, a grant free preamble, and the like.

FIG. 2 is a schematic diagram of a method 200 for grant free uplinktransmission performed at a base station device side according to anembodiment of the present disclosure.

The method 200 includes a step S201 of transmitting configurationinformation to a user equipment side, wherein a radio network temporaryidentifier (GF-RNTI) for grant free uplink transmission may bedetermined according to the configuration information; and otherconfiguration for grant free uplink transmission may also be determined,including: determining at least one of a time-frequency resource, apreamble, a de-modulation reference signal DMRS, and a multiple accesssignature MAS for grant free uplink transmission.

The configuration information includes at least one of a grant freeuplink transmission time-frequency resource set; a mapping relationshipbetween a grant free uplink transmission time-frequency resource and adownlink beam; a mapping relationship between a downlink beam and atleast one of a grant free preamble, a DMRS or a multiple accesssignature resource; a resource pool of GF-RNTI; a mapping relationshipbetween GF-RNTI and at least one of a time-frequency resource, apreamble, a DMRS, or a multiple access signature resource for grant freeuplink transmission; a control resource set for UE to monitor a grantfree uplink transmission feedback and/or configuration of search space;the maximum number of transmissions of the grant free uplinktransmission; and the maximum transmission time of the grant free uplinktransmission.

In addition, the configuration information may further include thenumber of times N that the user may repeatedly transmit data whenperforming one grant free uplink transmission, that is, each time the UEperforms the grant free uplink transmission, the UE will repeatedlytransmit data N times, for example, upon each transmission, the UErepeatedly transmits data N=4 times; in some embodiments, the data maybe a data part in the grant free transmission, or an entirety includinga preamble and a data part; in some embodiments, the number of times Nof repeated data transmission may be related to the size of the data tobe transmitted by the UE or the size of the resource configured by thebase station device, for example, if the transmit block size (TBS) hasfour types of TBS1, TBS2, TBS3, and TBS4, and TBS1<TBS2<TBS3<TBS4, thecorresponding number of times of repeated data transmission may also bedifferent, for example, there may be N1<N2<N3<N4 in one-to-onecorrespondence; in some embodiments, multiple TBSs may correspond to onesame N value; the configuration information may include one or morethresholds, when the TBS exceeds the threshold, and/or the resource sizeconfigured by the base station device is greater than the threshold, theUE determines the corresponding N value, such as a larger N value.

The method includes a step S202 of detecting user's signal transmissionon the configured grant free uplink transmission time-frequencyresource, and performing downlink feedback on the successfully detectedand decoded signal transmission, wherein the GF-RNTI corresponding tothe successfully detected and decoded signal transmission is used in thedownlink feedback.

FIG. 3 is a schematic diagram of interaction between a user equipmentand a base station device when performing grant free uplink transmissionaccording to an embodiment of the present disclosure.

Specifically, the base station transmits the configuration informationfor grant free uplink transmission to the user equipment by using thedownlink channel (such as the physical downlink control channel PDCCH,the physical downlink shared channel PDSCH, and the physical downlinkbroadcast channel PBCH). The configuration information for grant freeuplink transmission includes at least one of the following (1)-(8):

(1) Time-frequency resource set for grant free uplink transmission

The time-frequency resource set may be determined by at least one of thefollowing methods:

-   -   Explicitly indicating at least one of: the number of time units        and start positions of the time units; the number of frequency        domain units and start positions of the frequency domain units;        time-frequency resource repetition period, for example, the        configured resource is repeated every 10 ms, i.e.,        time-frequency resource configuration information is configured        according to each time-frequency resource repetition period.    -   Explicitly indicating the index of the grant free transmission        occasion (GFO), i.e. GFO index, one GFO is defined to transmit        time-frequency resource with one or more specific transmit block        sizes (TSS), and/or one or more specific MCSs, and/or one or        more specific preamble formats, and/or one or more specific DMRS        formats, and/or one or more specific MAS, i.e., consisting of M        time units and N frequency domain units; according to different        types and/or numbers of TBS, MCS, preamble format, DMRS format,        and MAS, the size of the time-frequency resource represented by        the corresponding GFO is different.

In some embodiments, a multi-level time unit relationship may beindicated, such as first indicating a time slot index of the grant freeuplink transmission time-frequency resource, and then indicating an OFDMsymbol start position of the GFO in each time slot, and the number ofGFOs; the configuration of GFO in each time slot may be the same; theGFO in each time slot may be continuous, that is, only the OFDM symbolstart position of the first GFO, and the number of GFOs in one time slotmay be notified to infer the positions of other GFOs in this time slot;

-   -   Determining the time-frequency resources of the grant free        uplink transmission by indicating the relative position with        respect to the configured random access time-frequency resource.        In some embodiments, the random access time-frequency resource        may be directly configured by the system information RMSI (as        indicated directly in the random access configuration table), or        may be the final valid random access resource obtained by        inference (such as the remained valid random access resources by        eliminating some unavailable random access resources in        consideration of the conflict with the downlink transmission,        the conflict with the SSB, and unable to meet the complete        mapping requirements, etc.).

Indicating the relative position with respect to the configured randomaccess time-frequency resource includes indicating relative positioninformation in the frequency domain of the grant free uplinktransmission time-frequency resource with respect to the configuredrandom access time-frequency resource, relative position information inthe time domain, or relative position information in the code domain;that is, performing frequency-division, time-division or code-divisionon the grant free uplink transmission time-frequency resource and theconfigured random access time-frequency resource as follows:

(1) Frequency-division on the grant free uplink transmissiontime-frequency resource and the configured random access time-frequencyresource

A frequency domain interval between the grant free uplink transmissiontime-frequency resource and the random access resource is indicated inthe configuration information, such as indicating that an intervalbetween the frequency domain start position of the grant free uplinktransmission resource and the lowest subcarrier in the lowest PRB of therandom access resource is W frequency domain units; the number of GFOsin the frequency domain may also be indicated in the configurationinformation, such as Z GFOs consecutive in the frequency domain.

FIG. 4 shows the following three frequency division cases (a)-(c) for arandom access opportunity (RACH occasion, RO) with a grant free uplinktransmission opportunity.

(a) Frequency division of one RO with one GFO. The time-divided preambleand data part are respectively transmitted in one GFO; the data part maybe composed of DMRS and data; in some embodiments, there may be only thedata part, that is, all GFO resources are used to transmit the datapart.

(b) Frequency division of multiple X (X>1) time-divided ROs with oneGFO. The preamble and the data part are respectively transmitted in oneGFO, and the preamble and the data part may be frequency-divided ortime-divided. For example, according to the time division, the preambleis transmitted within the resource size of the first X1 ROs in the GFO,and the data part is transmitted within the resource size of X2=X-X1ROs; taking 2 ROs as an example, X1=1, that is, the UE transmits thepreamble within the resource with first RO size in the GFO, andtransmits the data part within the resource with X2=1 ROs size in theGFO; the data part may be composed of DMRS and data; in someembodiments, there may be only the data part, i.e., all GFO resourcesare used to transmit the data part.

(c) Frequency division of one RO with one GFO. The frequency-dividedpreamble and data part are respectively transmitted in one GFO, and thedata part may be composed of DMRS and data; in some embodiments, theremay be only the data part, that is, all GFO resources are used totransmit the data part.

{circle around (2)} Time-division on the grant free uplink transmissiontime-frequency resource and the configured random access time-frequencyresource

A time interval between the grant free uplink transmissiontime-frequency resource and the random access resource may be indicatedin the configuration information, such as indicating that the timeinterval between the time start position of the grant free uplinktransmission resource and the random access resource is: the interval ofthe last OFDM symbol in the last RO in one time slot is W time units;and/or time interval between the time slot where the RO is located andthe time slot where the GFO is located, and the start OFDM symbolposition of the GFO in the time slot; and the number of GFOs in the timedomain may also be indicated in the configuration information, such as ZGFOs consecutive in the time domain.

FIG. 5 shows the following three time division cases (a)-(c) for arandom access opportunity and a grant free uplink transmissionopportunity.

(a) Time division of one RO with one GFO. The time-divided preamble anddata part are respectively transmitted in one GFO; the data part may becomposed of DMRS and data; in some embodiments, there may be only thedata part, that is, all GFO resources are used to transmit the datapart.

(b) Time division of multiple X (X>1) frequency-divided ROs with oneGFO. The preamble and the data part are respectively transmitted in oneGFO, and the preamble and the data part may be frequency-divided ortime-divided. For example, according to the frequency division, thepreamble is transmitted within the resource size of the upper X1 ROs inthe GFO, and the data part is transmitted within the resource size ofthe lower X2=X-X1 ROs; taking 2 ROs as an example, X1=1, that is, the UEtransmits the preamble within the resource with one RO size of the upperportion in the GFO, and transmits the data part within the remainingresource with the X2=1 RO size in the GFO; the data part may be composedof DMRS and data; in some embodiments, there may be only the data part,i.e., all GFO resources are used to transmit the data part.

(c) Time division of one RO with one GFO. The frequency-divided preambleand data part are respectively transmitted in one GFO, and the data partmay be composed of DMRS and data; in some embodiments, there may be onlythe data part, that is, all GFO resources are used to transmit the datapart.

{circle around (3)} Code division on the grant free uplink transmissiontime-frequency resource and the configured random access time-frequencyresource

The configuration information may indicate that some or all of therandom access resources may be used as the grant free uplinktransmission time-frequency resource, for example, indicating that thecorresponding RO index is an available grant free uplink transmissionresource. However, the configuration information may also indicate apreamble index or an index range used in the grant free uplinktransmission. For example, regarding the preambles used for randomaccess, the 0th to the (M_ra-1)th preambles generated by the rootsequence index being X and the cyclic shift being Y are used for randomaccess, and the (M_ra)th to (M_ra+M_gf-1)th preambles generated by theroot sequence index being X, and the cyclic shift being Y are used forthe grant free uplink transmission.

(2) The mapping relationship between the grant free uplink transmissiontime-frequency resource and the downlink beam

The downlink beam may be an index of a synchronization signal/PBCH block(SSB) or an index of a channel state information-reference signal(CSI-RS). Here, the SSB is mainly described as an example, and themapping relationship includes at least one of the following ways:

-   -   Configuring a separate mapping relationship between the grant        free uplink transmission time-frequency resource and downlink        beam.

The number of SSBs per GFO is defined, i.e., numOfSSBperGFO, and thenumber of SSBs that can be mapped onto one GFO may be inferred by the UEthrough the number of SSBs configured by the network base station.According to the principle of time domain priority or frequency domainpriority, the UE may infer the available GFO by the mapping relationshipafter selecting the SSB. For example, the network is configured with 4SSBs, and there are 4 GFOs in one period, where 2 GFOs are in frequencydomain and 2 GFOs are in time domain, as shown in FIG. 6 . FIG. 6 showsa schematic diagram showing time division of a random access opportunityand a grant free uplink transmission opportunity according to anembodiment of the present disclosure. The configured numOfSSBperGFO=2means that two SSBs are mapped onto one GFO. Taking the frequency domainpriority principle as an example, the UE may infer that the GFO indexescorresponding to SSB1 and SSB2 are GFO1 and GFO3, and the GFO indexescorresponding to SSB3 and SSB4 are GFO2 and GFO4.

-   -   Reusing the mapping relationship between the random access        time-frequency resource and the downlink beam.

For example, when the grant free uplink transmission time-frequencyresource has a certain relative relationship with the random accesstime-frequency resource (such as time division, frequency division, codedivision, etc.), the mapping relationship between the random accesstime-frequency resource and the downlink beam may be reused, to find thecorresponding time-frequency resource for grant free uplinktransmission;

-   -   A combination of the above two ways.

When the network base station does not configure a separate mappingrelationship between the grant free uplink transmission time-frequencyresource and the downlink beam, the UE uses the mapping relationshipbetween the random access time-frequency resource and the downlink beamto obtain the grant free uplink transmission time-frequency resourcecorresponding to the determined SSB. When the network base stationconfigures the separate mapping relationship between the grant freeuplink transmission time-frequency resource and the downlink beam, theUE uses the configured mapping relationship between the grant freeuplink transmission time-frequency resource and the downlink beam toobtain the grant free uplink transmission time-frequency resourcecorresponding to the determined SSB.

(3) Mapping relationship between the grant free uplink transmissionpreamble and/or de-modulation reference signal (DMRS) and/or multipleaccess signature (MAS) resource and the downlink beam

In this embodiment, M_code is used to indicate the maximum number ofpreambles for grant free uplink transmission available on one GFO,and/or the maximum number of de-modulation reference signals (DMRS),and/or the maximum number of multiple access signatures (MAS). Themaximum number may be the available maximum number configured by system,or the physically available maximum number.

In this embodiment, the multiple access signature may be a combinationof one or more of: a bit-level spreading spectrum sequence, a bit-levelinterleaving sequence, a bit-level scrambling sequence, a bit-level tosymbol-level codeword or codebook, a symbol-level spreading spectrumsequence, a symbol-level scrambling sequence, a symbol-levelinterleaving sequence, a symbol to resource element (RE) mappingcodebook or pattern; power factor, phase factor, etc. In someembodiments, the spreading spectrum sequence may be a complex spreadingspectrum sequence or a sparse spreading spectrum sequence, i.e., aspreading spectrum sequence containing zero values. In some embodiments,the bit-level to symbol-level codeword or codebook may be a sparsebit-level to symbol-level codeword or codebook, i.e., a bit-level tosymbol-level codeword or codebook containing zero values. In someembodiments, the symbol to RE mapping codebook or pattern may be asparse symbol to RE mapping codebook or pattern, i.e., some REs are notmapped with symbols.

In this embodiment, the mapping relationship includes at least one ofthe following ways:

-   -   Configuring a separate mapping relationship between the preamble        and/or DMRS and/or multiple access signature resource for the        grant free uplink transmission and the downlink beam.

The number of SSBs per GFO is defined, i.e. numOfSSBperGFO, and thenumber of SSBs that can be mapped onto one GFO may be inferred by the UEthrough the number of SSBs configured by the network base station;according to the principle of time domain priority or frequency domainpriority, the UE may infer the available GFO by the mapping relationshipafter selecting the SSB; then the M_code is divided into numOfSSBperGFOgroups, and each group corresponds to one SSB; taking DMRS sequences asan example, if the DMRS sequences available on one GFO is at mostM_code=12, and numOfSSBperGFO=2, the UE may know two SSBs mapped ontothe GFO, and each SSB corresponds to six DMRS sequences respectively; ifSSB1 and SSB2 are taken as examples, it can be seen that SSB1corresponds to DMRS 0˜5, and SSB2 corresponds to DMRS 6−11; inparticular, the SSB may also determine the corresponding DMRS accordingto a certain interval rule, such as SSB1 corresponding to even DMRSindexes (DMRS 0, 2, 4, 6, 8, 10), and SSB2 corresponding to odd DMRSindexes (DMRS 1, 3, 5, 7, 9, 11); in particular, the SSB may alsodetermine the corresponding DMRS according to a certain root sequenceindex (sequential root sequence), for example, SSB1 corresponds to theDMRS sequence generated by root sequence 1, and SSB2 corresponds to theDMRS sequence generated by root sequence 2;

-   -   Reusing the mapping relationship between the random access        preamble and the downlink beam to obtain a preamble for the        grant free uplink transmission, and obtaining DMRS and multiple        access signature resource for grant free uplink transmission        through the mapping relationship between the preamble for the        grant free uplink transmission and the DMRS or multiple access        signature resource.

For example, by using the mapping relationship between the random accesspreamble and the downlink beam, the available preamble resources for thegrant free uplink transmission corresponding to the determined SSB areobtained, and a preamble is selected, so that an available DMRS sequenceor sequence set may be obtained through the corresponding mappingrelationship between the preamble and the DMRS (e.g., 1 to 1, N to 1, 1to N, N to M, etc.), and then the UE may determine the used DMRSsequence, if 1 to 1, the UE may determine the available DMRS sequenceafter the preamble is determined, and if 1 to N, the UE may determinethe available DMRS sequence set after the preamble is determined, andthe UE randomly selects a DMRS sequence from the set in equalprobability; the manner of determining the MAS is similar. In someembodiments, the preamble is mapped to DMRS and then remapped to MAS, orthe preamble is mapped to MAS and then remapped to DMRS, or the preambleis mapped with DMRS and MAS, respectively.

-   -   Reusing the mapping relationship between the random access        preamble and the downlink beam to obtain the available preamble        resources for the grant free uplink transmission corresponding        to the determined SSB, but for the mapping relationship between        the DMRS and/or the multiple access signature resource and the        downlink beam, the available DMRS and/or multiple access        signature resources for the grant free uplink transmission        corresponding to the determined SSB may be obtained according to        the foregoing configured separate mapping relationship between        the preamble and/or DMRS and/or multiple access signature        resource for grant free uplink transmission and the downlink        beam.    -   A combination of the above ways.

For example, if the network is configured with a separate mappingrelationship between the preamble and/or DMRS and/or multiple accesssignature resource for grant free uplink transmission and the downlinkbeam, the available preamble and/or DMRS and/or multiple accesssignature resource for grant free uplink transmission corresponding tothe determined SSB is obtained according to the mapping relationship. Ifthe network is not configured with a separate mapping relationshipbetween the preamble and/or DMRS and/or multiple access signatureresource for grant free uplink transmission and the downlink beam, theUE obtains the available preamble and/or DMRS and/or multiple accesssignature resource for grant free uplink transmission corresponding tothe determined SSB, according to the mapping relationship between therandom access preamble and the downlink beam, with the methods ofmapping relationship between the preamble and DMRS and/or MAS asdescribed above.

(4) Resource pool for radio network temporary identifier (GF-RNTI) forgrant free uplink transmission

The resource pool includes a set of M available RNTI values, and the UEmay select, in equal probability, one RNTI from the M RNTIs as theGF-RNTI for the grant free uplink transmission.

(5) Mapping relationship between GF-RNTI and at least one of thetime-frequency resource for grant free uplink transmission, the grantfree preamble, DMRS, and the multiple access signature resource

Taking the time-frequency resource for the grant free uplinktransmission as an example, the mapping relationship between thetime-frequency resource for the grant free uplink transmission and theGF-RNTI is established. For example, if one GFO is mapped with oneGF-RNTI value or one GF-RNTI set, the UE obtains the available GF-RNTIvalue or the set (the UE may randomly select one GF-RNTI from the set inequal probability), by the determined time-frequency resource for thegrant free uplink transmission. Other methods using the mappingrelationship between the grant free preamble/DMRS/multiple accesssignature resource and the GF-RNTI are similar.

(6) A control resource set for UE to monitor a grant free uplinktransmission feedback and/or configurations of search spaces

From the configuration information, the UE may obtain at least one ofthe following control resource information for monitoring the grant freeuplink transmission feedback:

-   -   Frequency domain position (the frequency domain starting        position, the number of frequency domain units). The frequency        domain starting position may be an absolute starting position        (e.g., notified by an absolute frequency value), and/or a        relative starting position, such as based on a reference point,        and then notifying a frequency domain offset to find the        frequency domain starting position, wherein the reference point        may be a reference point of the entire frequency domain carrier,        and/or a reference point of a bandwidth part (BWP) in the        carrier; the frequency domain offset may indicate how many        frequency domain units are offset.    -   Time domain position (the time domain starting position, the        number of time units). The time domain starting position may be        an absolute starting position, such as notified by a specific        system frame number (SFN) and/or a subframe index in a system        frame, and/or a time slot index, and/or an OFDM symbol index,        and/or a relative starting position, such as relative to a        reference time position, and then notifying an offset on the        time unit, the reference time position may be the last OFDM        symbol of PDSCH/PDCCH/PBCH configured with the received system        information, or the last OFDM symbol in the time slot; the        offset on the time unit may be a one-level time unit offset,        such as N time slots, or a multi-level time unit offset, such as        N1 time slots and N2 OFDM symbols.    -   Monitoring period. The UE is notified of the time period within        which the monitoring detection repeats. The monitoring period        may be an absolute time such as 5 ms, 10 ms, 20 ms, 40 ms, etc.;        or the number of time units, such as 1 time slot, 1 subframe,        and the like.    -   Maximum number of detections. The UE is notified of the number        of PDCCH candidates that need to be monitored corresponding to        an aggregation level (AL) on a control resource for detecting        the grant free uplink transmission feedback.    -   In some embodiments, the configuration information may also        inform the UE of the number of control resources available to        detect the grant free uplink transmission feedback in one        monitoring period, such as the number of control resource sets,        and/or the number of search spaces; and/or inform the UE of the        number of control resources for detecting the grant free uplink        transmission feedback that need to be monitored in one        monitoring period, when the total number M_all of control        resources available in one monitoring period is greater than the        number M_need of control resources that the UE needs to monitor,        that is, M_all>M_need, the UE also needs to determine the        positions of the M_need control resources that need to be        monitored, for example, the former M_need or latter M_need in        the M_all, or the corresponding M_need indexes in the M_all        explicitly indicated in the configuration information.

(7) Maximum number N_max of transmissions of the grant free uplinktransmission

(8) Maximum transmission time T_time of the grant free uplinktransmission

Referring back to FIG. 3 , the user receives, from the downlink channel,a system broadcast message (including a primary broadcast message, RMSIand/or other system information OSI) of the base station or downlinkcontrol channel information or higher layer control signalinginformation; the user obtains configuration information for performingthe grant free uplink transmission; the UE determines GF-RNTI for thegrant free uplink transmission according to a certain rule, wherein thecertain rule may include at least one of the following:

-   -   The UE obtains a RNTI resource pool (i.e., a RNTI resource set)        for the user performing grant free uplink transmission from the        configuration information, and selects one RNTI from the RNTI        resource pool in equal probability as the GF-RNTI for performing        the grant free uplink transmission by itself.    -   Determining the GF-RNTI for the grant free uplink transmission        according to the mapping relationship between the GF-RNTI and at        least one of the time-frequency resource, the preamble, the        DMRS, and the multiple access signature resource for grant free        uplink transmission in the configuration information.

Specifically, the UE obtains, from the configuration information, amapping relationship between the GF-RNTI and the time-frequencyresource/preamble/DMRS/multiple access signature resource for grant freeuplink transmission; and determines a corresponding GF-RNTI by selectingthe time-frequency resource/preamble/DMRS/multiple access signatureresource for grant free uplink transmission. Taking the grant freeuplink transmission time-frequency resource as an example, by using themapping relationship between the grant free uplink transmissiontime-frequency resource and the GF-RNTI, for example, one GF-RNTI valueor one GF-RNTI set is mapped onto one GFO, the UE obtains an availableGF-RNTI value or set (the UE may randomly select one GF-RNTI from theset in equal probability) by the determined grant free uplinktransmission time-frequency resource. Other methods using the mappingrelationship between the grant free preamble/DMRS/multiple accesssignature resource and the GF-RNTI are similar.

-   -   The UE calculates the GF-RNTI for the grant free uplink        transmission according to the determined grant free uplink        transmission time-frequency resource, and/or the selected grant        free uplink transmission time-frequency        resource/preamble/DMRS/multiple access signature resource.        Wherein, the calculation method is as follows:

Performing the calculation according to GFO index where the determinedgrant free uplink transmission time-frequency resource is positioned,and/or the time unit index (such as the slot index), and/or the OFDMsymbol index, and/or the subframe index, and/or the carrier index (thecarrier index may refer to different carriers, or supplemental uplinkcarriers or non-supplemental uplink carriers), etc.; possiblecalculation methods include:

GF-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id; wherein s_id isthe index of the first OFDM symbol in which the GFO determined by the UEis positioned, and t_id is the slot index in the system frame in whichthe GFO determined by the UE is positioned; f_id is the index of the GFOdetermined by the UE in the frequency domain; ul_carrier_id is thecarrier index determined by the UE to transmit the grant free uplinktransmission.

-   -   When determining the grant free uplink transmission        time-frequency resource based on the configured random access        time-frequency resource, the GF-RNTI is obtained by calculating        the radio network temporary identifier RA-RNTI on a        corresponding random access channel. For example, the random        access channel is mapped with the grant free uplink transmission        time-frequency resource, a corresponding random access channel        is found by using the determined grant free uplink transmission        time-frequency resource, and the RA-RNTI calculated on the        corresponding random access channel is used.

In addition, the UE may also determine the grant free uplinktransmission time-frequency resource and/or preamble and/or DMRS and/ormultiple access signatures according to at least one of the followingways.

-   -   Mapping relationship between the time-frequency resource and/or        the preamble and/or DMRS and/or MAS resource for grant free        uplink transmission and the downlink beam; and    -   Mapping relationship between GF-RNTI and the time-frequency        resource/the preamble/DMRS/multi-access signature resource for        grant free uplink transmission.

The GF-RNTI determined by the above several methods may also be used forthe user to generate a scrambling sequence c when the grant free uplinktransmission is to be performed.

For example, the user channel-encodes the prepared information bitsequence to a single-stream or multi-stream encoded bit sequence b(0), .. . , b(M−1), wherein M is the length of the encoded bit sequence, andin particular, when the user performs multi-stream transmission, M maybe the total length before the shunt, or the length of the single streamafter the shunt. The encoded bit sequence needs to be scrambled beforemodulation to obtain the scrambled encoded sequence s(0), . . . ,s(M−1), with s(i)=[b(i)+c(i)] mod 2, and mod2 represents modulo 2operation; wherein the initialization value c_init of the scramblingsequence c(0), c(M−1) is obtained by one of the following formulas:

c_init=n_rnti*2¹⁵ +n_id

c_init=n_rnti*2¹⁴ +q*2¹³ +└n _(s)/2┘*2⁹⁺ n_id

Wherein, n_id may be a data scrambling identity configured by the higherlayer signaling, or a network identifier (cell id, N_(ID) ^(cell)) ofthe cell; ns is a time unit index, for example, representing a slotnumber in a system frame (slot index in a radio frame); q may be acodeword index, such as when there is only one single codeword fortransmission, q=0; in the present disclosure, for the grant free uplinktransmission, n_rnti may be GF-RNTI; and the method for determiningGF-RNTI has been described in the above several methods, and will not bedescribed again.

The scrambling sequence c(0), . . . , c(M−1) may be generated by a Goldsequence of length 31, such as

c(n)=[x1(n+Nc)+x2(n+Nc)]mod 2, and

x1(n+31)=[x1(n+3)+x1(n)]mod 2; and

x2(n+31)=[x2(n+3)+x2(n+2)+x2(n+1)+x2(n)] mod 2;

Wherein Nc is a fixed value, such as Nc=1600; x1 and x2 represent two Msequences of length 31, respectively; and x1 (n) is initialized tox1(0)=1, x1(n)=0, n=1, 2, . . . , 30; and x2(n) is initialized to c_initgenerated above, such as

${{c\_ init} = {\sum\limits_{i = 0}^{30}{{x_{2}(i)}*2^{i}}}},$

which means that c_init is converted to a binary number, and then thedata corresponding to the i-th bit is the value of x2(i).

The above is an example of generating a scrambling sequence, not limitedto the only way;

When the UE starts the initialization setting of the grant free uplinktransmission, if the configuration information received by the UEincludes the maximum number of transmissions N_max of the grant freeuplink transmission and/or the maximum transmission time T_time of thegrant free uplink transmission, and if this is the first transmission ofthe data by the UE, that is, the initial transmission, the UE sets atransmission counter GF_transmission_counter to 1, and/or starts atransmission timer GF_transmission_timer after the first transmission.

The UE performs the grant free uplink transmission. The uploaded datamay include a user identifier (ID) for conflict resolution. The user IDmay be one or more of the following:

-   -   Temporary Mobile Subscriber Identity S-TMSI;    -   C-RNTI (users who have already obtained a valid C-RNTI);    -   a fixed random number, such as N-bit (N is a positive integer,        such as 40) random number;

Referring to FIG. 3 , the base station detects uplink signaltransmission from the user on the time-frequency resource configured forgrant free uplink transmission. Downlink feedback is performed on thesuccessfully detected and decoded uplink signal, and GF-RNTIcorresponding to the successfully detected and decoded signal is used inthe downlink feedback. If the downlink control channel is used to feedback to the user, the GF-RNTI scrambling is used in the cyclicredundancy check (CRC) of the downlink control channel; the downlinkfeedback may include one or more of the following:

-   -   Uplink transmission grant for new data;    -   Uplink grant for data retransmission;    -   An identity, such as an ACK, indicating that the previous uplink        transmission was successful or that no data retransmission is        required;    -   A conflict resolution identifier which may be a user identifier        used by the UE for conflict resolution included in the grant        free uplink transmission;    -   Temporary C-RNTI value; and    -   Timing advance information.

With continued reference to FIG. 3 , the UE detects possible feedbackfrom the base station on the time-frequency resource obtained from thedetermined control resource set and/or the search space configurationfor monitoring the grant free uplink transmission feedback through thepreviously determined GF-RNTI for the grant free uplink transmission.When the CRC of the detected PDCCH is descrambled by using the GF-RNTI,if the CRC after the descrambling is successful, the UE obtains thecorrect PDCCH. The feedback to the UE from the base station may bedirectly in the PDCCH or in PDSCH specified by the downlink schedulingin the PDCCH.

In the feedback detected by the UE:

-   -   When a conflict resolution identifier matching the user        identifier for conflict resolution included in the grant free        uplink transmission of the UE is included, the UE considers the        feedback to be the correct feedback matching itself;    -   When the uplink transmission grant for new data is included, the        UE transmits the new data according to the uplink transmission        grant for the new data;    -   When the uplink grant for data retransmission is included, the        UE performs retransmission of data according to the        retransmission uplink transmission grant for the previous data;    -   When an identifier (such as ACK) is included to indicate that        the previous uplink transmission has succeeded, or when data        retransmission is not required, the UE considers that the        previous transmission is completed without retransmission or new        transmission;    -   When a temporary C-RNTI value is included, if the UE does not        have a C-RNTI before, the temporary C-RNTI value is set to its        own C-RNTI value; if the UE has a C-RNTI value before, the        previous C-RNTI is cleared, and the temporary C-RNTI value is        set to its own C-RNTI value.    -   When timing advance information is included, if the UE receives        feedback from the base station at time N, the UE performs uplink        transmission using the indicated timing advance information in a        time unit after N+k; the uplink transmission includes subsequent        grant free transmission or grant-based transmission;

In some embodiments, when the UE does not detect the correct feedback(e.g., the correct PDCCH is not detected) or the detected feedback doesnot match the user identifier for conflict resolution previouslyincluded in the grant free uplink transmission, the UE may perform thefollowing operations:

-   -   If the transmission timer GF_transmission_timer has not timed        out, and/or the transmission counter GF_transmission_counter is        incremented by 1 and the value of the transmission counter after        incremented by 1 does not exceed the maximum number of        transmissions N_max of the grant free uplink transmission, that        is, GF_transmission_counter+1≤N_max, the UE re-performs the        grant free uplink transmission; or    -   If the transmission timer GF_transmission_timer times out,        and/or the transmission counter GF_transmission_counter is        incremented by 1 and the value of the transmission counter after        incremented by 1 exceeds the maximum number of transmissions        N_max of the grant free uplink transmission, i.e.        GF_transmission_counter+1>N_max, the UE stops the grant free        uplink transmission, and reports to the upper layer the grant        free uplink transmission problem.

In particular, in another embodiment of the present disclosure, atwo-step random access transmission using the grant free uplinktransmission method proposed by the present disclosure will bedescribed. In the present embodiment, the grant free uplink transmissioncan be regarded as including two cases:

1. If the grant free uplink transmission includes random access preambletransmission and uplink data transmission, in particular, thetime-frequency resource position of the random access preambletransmission in the grant free uplink transmission time-frequencyresource is referred to as a two-step random access preambletime-frequency resource, and the time-frequency resource position of theuplink data transmission is referred to as a two-step random accessuplink data time-frequency resource; at this time, if the systemconfigures a random access time-frequency resource, the random accesstime-frequency resource may be represented as a four-step random accesstime-frequency resource; then the method described in the aboveembodiment may be used for

a) Determining the grant free uplink transmission resources (includingthe random access resource for the preamble in the grant free uplinktransmission and the resource for the data part in the grant free uplinktransmission) by using a relative relationship between the configuredfour-step random access resource and the grant free uplink transmission;for example, in the grant free uplink transmission resources, thetime-frequency resource where the preamble is located begins from thefirst time unit routinely, and the relationship between the resource forthe data part and the preamble is pre-fixed or pre-configured, as shownin FIG. 9 , taking the time unit as an example only, the time intervalT1 and/or T2 may be pre-defined or pre-configured at the network side;the method using the relative relationship in combination with timeand/or frequency domain is similar, or

b) Determining the resources for the preamble in the grant free uplinktransmission by using a relative relationship between the configuredfour-step random access resource (time-frequency resource and/orpreamble resource) and the random access resource (time-frequencyresource and/or preamble resource) for the preamble in the grant freeuplink transmission; and determining the resources for the data part inthe grant free uplink transmission by configuring a relativerelationship between the resource for the preamble in the grant freeuplink transmission and the resource (time-frequency resource and/orDMRS resource) for the data part in the grant free uplink transmission.

2. If the grant free uplink transmission simply includes the uplink datatransmission (that is, does not include the preamble transmission), thetime-frequency resource location of the uplink data transmission isreferred to as a two-step random access uplink data time-frequencyresource; at this time, if the system configures a random accesstime-frequency resource, the random access time-frequency resource maybe represented as a two-step random access time-frequency resource; thenthe method described in the above embodiment may be used to determinethe grant free uplink transmission resources (that is, the resource forthe data part in the grant free uplink transmission) by using theconfigured two-step random access resource, and a relative relationshipbetween the pre-defined or pre-configured two-step random accessresource and the grant free uplink transmission; as shown in FIG. 10 ,taking the time unit as an example only, the time interval T3 may bepre-defined or pre-configured at the network side.

In particular, the time interval (i.e., relative relationship in timedomain) in the above description may also be replaced by combining thetime domain relative positional relationship and/or the frequency domainrelative relationship; the method is similar and will not be describedagain.

In this embodiment, the base station transmits configuration informationfor transmitting and receiving (referred to as a 2 step RACH procedurein the present embodiment) of the uplink signal of the presentdisclosure to the user in system information, downlink controlinformation, upper layer control information (such as RRC configurationmessage), and handover command message through the downlink channel(such as the downlink control channel PDCCH, the downlink shared channelPDSCH, and the downlink broadcast channel PBCH); the UE receives theconfiguration information, where the configuration information used forthe two-step random access includes at least one of the following:

1. Random access resource configuration (including random accesstime-frequency resource and/or preamble resource)

a) If the two-step random access time-frequency resource is shared withthe four-step random access time-frequency resource (for example,predefined at the network side (default) or informing the UE of thesharing of the two-step random access time-frequency resource andfour-step random access time-frequency resource via the SI, DCI, RRCmessage), then

i. For the configuration of the two-step random access time-frequencyresource, the four-step random access time-frequency resourceconfiguration is reused, that is, according to the starting position ofthe four-step random access time-frequency resource configured at thenetwork side, and/or the number of the four-step random accesstime-frequency resources, and/or the four-step random accesstime-frequency resource period, and/or the mapping relationship betweenthe four-step random access time-frequency resource and the downlinksignal (SSB and/or CSI-RS), etc., the UE may find available two-steprandom access time-frequency resource;

-   -   In particular, the two-step random access time-frequency        resource is a part of common four-step random access        time-frequency resource; including at least one of the following        partial sharing methods:

A. Partial time domain sharing; that is, the network configures thestarting position and/or the number of the two-step random accesstime-frequency resource in the time domain on the four-step randomaccess time-frequency resource; the UE obtains the two-step randomaccess time-frequency resource by receiving the configurationinformation, the configuration information may indicate the index of thestarting RO and/or the number of ROs by direct N bits; or for example,indicate that the ROs after starting from the X-th RO are the two-steprandom access time-frequency resource through a relative relationship;for example, the four-step random access time-frequency resource has 4ROs in the time domain as shown in FIG. 11 , which are represented as RO0˜3; if the time domain starting location of the two-step random accesstime-frequency resource is RO 2, and the number is 2, it indicates thatthe two-step random access time-frequency resource is the random accesstime-frequency resource in the last two RO positions in the time domain;

B. Partial frequency-domain sharing; that is, the network configures thestarting position and/or the number of the two-step random accesstime-frequency resource in the frequency domain on the four-step randomaccess time-frequency resource; the UE obtains the two-step randomaccess time-frequency resource by receiving the configurationinformation, the configuration information may indicate the index of thestarting RO and/or the number of ROs by direct N bits; or for example,indicate that the ROs after starting from the Y-th RO are the two-steprandom access time-frequency resource through a relative relationship;for example, the four-step random access time-frequency resource has 4ROs in the frequency domain as shown in FIG. 12 , which are representedas RO 0˜3; if the time domain starting location of the two-step randomaccess time-frequency resource is RO 2, and the number is 2; itindicates that the two-step random access time-frequency resource is therandom access time-frequency resource in the last two RO positions inthe frequency domain;

C. Partial time-frequency domain sharing; that is, the networkconfigures the starting position and/or the number of the two-steprandom access time-frequency resource in the time domain and frequencydomain on the four-step random access time-frequency resource; the UEobtains the two-step random access time-frequency resource by receivingthe configuration information, the configuration information mayindicate the index of the starting RO and/or the number of ROs by directN bits; or for example, indicate that the ROs after starting from theX/Y-th RO are the two-step random access time-frequency resource througha relative relationship; for example, the four-step random accesstime-frequency resource has 4 ROs in the time domain and frequencydomain respectively as shown in FIG. 11 , which are represented as RO_T0˜3 and RO_F 0˜3; if the time domain starting location of the two-steprandom access time-frequency resource is RO_T=1, and the number is 2 andRO_F=3 and the number is 1, it indicates that the two-step random accesstime-frequency resource is the random access time-frequency resource inthe second and third positions in the time domain and in the last one ROposition in the frequency domain;

ii. For the configuration of the two-step random access preambleresource, the UE needs to determine:

The starting point of the available two-step random access preambleindex; the determination method may be at least one of the following:

A. The UE determines by using a default (preset) preamble index startingposition, such as starting from a random access preamble index of 0 orthe same as the determined four-step random access preamble index asdefault;

B. The UE determines by the preamble index starting position configuredat the network side, such as by PreambleFor2stepRACHStart;

C. The UE calculates by using the four-step random access preamble indexstarting point. If the UE determines the four-step random accesspreamble index starting point is represented asPreambleFor4stepRACHStart (for example, for a selected SSB index, thestarting position of the preamble mapped thereto is determined), and thenumber of available four-step random access preamble indices is X (forexample, for a selected SSB index, the number of preambles mappedthereto is determined), thenPreambleFor2stepRACHStart=PreambleFor4stepRACHStart+X; specifically, thenetwork configuration information may directly indicate that N four-steprandom access preambles are the two-step random access preamble, and theN preambles may be predefined as those having N minimum (maximum) indexvalues in the four-step random access preambles.

-   -   The number of available two-step random access preambles; the        determination method may be at least one of the following:

A. The UE determines by using a default (preset) number of preambles,for example, the number of available preambles preset by the system isN, or as default, the same as the number of four-step random accesspreambles;

B. The UE determines by the number of preambles configured at thenetwork side, such as by numberOfPreambleFor2stepRACH; in particular,the value may be a specific indication of the number of preambles of theset A, for example

numberOfRA-PreamblesFor2stepRAGroupA INTEGER (1.64)

wherein, when the data size in the user's message A is less than (notgreater than) a preset or configured threshold S1, and/or the downlinkPL (and/or RSRP) measured by the user is less than (not greater than) apreset or configured threshold S2, the UE selects the preamble from theset A; when the data size in the user's message A is not less than(greater than) a preset or configured threshold S1, and/or the downlinkPL (and/or RSRP) measured by the user is not less than (greater than) apreset or configured threshold S2, the UE selects the preamble from theset B; at this time, the number of preambles in the set B is the numberof all available preambles minus the number of available preambles inthe set A; and the starting position of the preambles in set B may bethe starting position of set A plus the number of available preambles inset A; in particular, the network configuration information may directlyindicate that N four-step random access preambles are the two-steprandom access preamble, the N preambles may be predefined as thosehaving N minimum (maximum) preamble index values in the four-step randomaccesses (all or set A or set B);

C. The UE calculates by using the number of four-step random accesspreambles, if the starting point of the four-step random access preambleindex determined by the UE is represented asnumberOfRA-PreamblesFor4stepRACH (for example, for a selected SSB index,the number of the mapped preamble is determined), determination is madebased on a preset or configured relative relationship, such as themultiple relationship BETA (i.e.numberOfRA-PreamblesFor2stepRACH=numberOfRA-PreamblesFor4stepRACH*BETA),or the difference relationship D (i.e.numberOfRA-PreamblesFor2stepRACH=numberOfRA-PreamblesFor4stepRACH+D); inparticular, the method of determining the preamble can be applied to thedetermination of the number of preambles of the set A or B separately.

b) When the two-step random access time-frequency resource is not sharedwith the four-step random access time-frequency resource (for example,predefined (default) at the network side or informing the UE of thetwo-step random access time-frequency resource not shared with thefour-step random access time-frequency resource via the SI, DCI, RRCmessage), that is, the UE separately notifies by the two-step randomaccess time-frequency resource, then

i. For the configuration of the two-step random access time-frequencyresource, the method for determination by the UE includes:

-   -   Fully separate notification, for example, the UE acquires the        configuration of the two-step random access time-frequency        resource by reading information indicated by the 2step        RACH-ConfigCommon, wherein the indicated information includes at        least one of the following:

A. The number of SSBs on each RO and/or the number of preamblescorresponding to each SSB, ssb-perRACH-OccasionAndCB-PreamblesPerSSB;

B. The random access configuration index, prach-Configurationlndex, theindicated configuration of the two-step random access time-frequencyresource in the time dimension, including: a two-step random accessconfiguration period (that is, the configured two-step random accesstime-frequency resource periodically repeating on a time unit at onepoint); the length of time occupied in each cycle (for example, 10 ms)and the position X_2 step of the time length (for example, the period is40 ms, the time length 10 ms of the random access time-frequencyresource is the (X_2 step)th 10 ms in 40 ms, for example X_2 step=2, X_2step mod(4)=2, representing the second 10 ms); the number and positionsof ROs configured in the occupied time length;

C. The number of ROs in the frequency domain on the same time unit;

D. The starting position of the RO in the frequency domain.

-   -   Notifying relative relationship configuration information of the        four-step random access time-frequency resource (in time domain        and/or frequency domain), that is, the UE acquires configuration        information of the two-step random access time-frequency        resource by the configured four-step random access        time-frequency resource information and relative relationship        configuration information with respect to the four-step random        access time-frequency resource (in time and/or frequency        domain); wherein, the relative relationship configuration        information with respect to the four-step random access        time-frequency resource (in time and/or frequency domain)        includes at least one of the following:

A. Time domain relative position information indication, including atleast one of the following:

I) A relative relationship beta of the two-step random accessconfiguration period 2stepRACH_period relative to the four-step randomaccess configuration period 4stepRACH_period, indicating that2stepRACH_period=beta*4stepRACH_period, for example, 4stepRACH_period=20ms, beta=2, 2stepRACH_period is 40 ms; in particular, the relativerelationship beta may also be preset by the system;

II) The offset (X_delta time units) of the position X_2 step of the timelength (for example, 10 ms) occupied by the two-step random accesstime-frequency resource relative to the position X_4 step of the timelength(for example, 10 ms) occupied by the four-step random accesstime-frequency resource in each random access configuration period, thenX_2 step=X_4 step+X_delta, for example, the random access configurationperiod is 40 ms, X_delta=1, X_4 step=1, indicating the time lengthoccupied by the four-step random access time-frequency resource is thefirst 10 ms in 40 ms, and the time length occupied by the two-steprandom access time-frequency resource is the next 10 ms relative to thetime length occupied by the four-step random access time-frequencyresource, that is, the second 10 ms in 40 ms;

as shown in FIG. 14 , the random access configuration period is 20 ms,and the time length occupied by the four-step random accesstime-frequency resource is the first 10 ms in one random accessconfiguration period, and X_delta=1, then the time length occupied bythe two-step random access time-frequency resource is the second 10 msafter the first 10 ms in one random access configuration period, and thenumber and positions of ROs in the time length occupied by the two-steprandom access time-frequency resource is the same as the number andpositions of ROs in the time length occupied by the four-step randomaccess time-frequency resource;

III) The number, and/or position, and/or period of the two-step randomaccess time-frequency resource in time domain Pre-defined or networkconfigured being the same as the number and positions of the four-steprandom access time-frequency resource in time domain;

B. Relative position information indication in frequency domain,including at least one of the following (if it indicates that thestarting position of the first RO in the frequency domain on the sametime unit of the four-step random access resource is FDMed_RO_start_4step and/or the number of ROs in the frequency domain on the same timeunit is N_FDMed_RO_4 step):

I) Interval size (that is, N frequency domain units) between thestarting position (for example, the first subcarrier on the RO) of thefirst RO in the frequency domain of the two-step random accesstime-frequency resource and the ending position (for example, the lastsubcarrier on the RO) of the last RO in the frequency domain of thefour-step random access time-frequency resource; as shown in FIG. 15 ,when the UE receives the indication that the interval size is 4frequency domain units, the first frequency domain unit after the fourfrequency domain units starting from the ending position of the last ROof the four-step random access time-frequency resource is determined asthe starting position of the first RO of the two-step random accesstime-frequency resource in the frequency domain;

II) The number of ROs of the two-step random access time-frequencyresource in the frequency domain, which can be directly indicated by Nbits, or predefined as the indication that the number of ROs of thefour-step random access time-frequency resource in the frequency domainis reused (i.e., the same as the number of ROs of the four-step randomaccess time-frequency resource in the frequency domain), or configuredas a relative relationship (for example, the proportional size) with thenumber of ROs of the four-step random access time-frequency resource inthe frequency domain.

C. Mapping relationship with the downlink beam; the mapping rule andcorresponding parameter setting of the four-step random accesstime-frequency resource and the downlink beam may be reused;

ii. For the configuration of the two-step random access preambleresource,

c) The format of the two-step random access preamble may be determinedby at least one of the following:

i. Separate network side configuration, for example by preambleFormat_2step to indicate the format for the two-step random access preamble, forexample by 2 bits to inform 4 possible preamble format configurations(including cyclic prefix length, and/or sequence length, and/orsubcarrier spacing, and/or set of restrictions), in particular, thepossible preamble configuration may be in the form of a preset table;

-   -   In particular, the UE does not desire to receive a two-step        random access preamble configuration different from the        time-frequency resource size (i.e., the size of one        corresponding RO) occupied by the four-step random access        preamble; for example, if the RO corresponding to the four-step        random access preamble occupies 2 OFDM symbols (such as A1        configured as a short sequence), the two-step random access        preamble that the UE desires to receive also occupies 2 OFDM        symbols (such as A1 and/B1);

ii. Determined by the configured four-step random access preambleformat; that is, the network configures a four-step random accesspreamble format, and the UE sets the format for the two-step randomaccess preamble according to the four-step random access preambleformat;

d) Other random access resource configuration information, including atleast one of the following:

i. The target receiving power of the two-step random access;

ii. The maximum number of retransmissions of the two-step random access;

iii. Four-step random access fallback indication; if it is enabled, theUE falls back to the four-step random access when certain conditions aremet;

iv. Indication of the two-step random access resource usage; if it isenabled, the UE preferentially performs the two-step random access whenthe UE simultaneously configures four-step and two-step random accessresources;

2. Data part (PUSCH and/or DMRS) resource configuration, including atleast one of the following:

a) Time domain position configuration of PUSCH time-frequency resource:

i. Time-domain interval (that is, N time units) between the PUSCHtime-frequency resource configured by the network device and thecorresponding two-step random access time-frequency resource; and/or thetime length occupied by the PUSCH time-frequency resource configured bythe network device, that is, M1 time units or M1 two-step random accessPUSCH resource units (the definition of the resource unit is similar tothe definition of the GFO in the foregoing embodiments, i.e., thetime-frequency resource size for transmitting a data part of a specificsize is composed of predefined X time units, and Y frequency domainunits); then the UE determines the first time unit after N (orN+x_id*M1; or N+x_id*M1*X; or N+x_id*M1+delta; or N+x_id*M1*X+delta)time units after the last time unit in the time range of the selectedtwo-step random access time-frequency resource as the time domainstarting position of the two-step PUSCH time-frequency resourcecorresponding to the selected two-step random access time-frequencyresource. Wherein x_id may be the index t_id in the time domain of theselected RO, or an RO index, and delta is a predefined or configuredadditional time unit interval, its purpose could be to avoidinter-symbol interference as much as possible. The time range of theselected two-step random access time-frequency resource may be at leastone of the following:

-   -   the selected two-step random access time-frequency resource        (i.e. selected RO);    -   The random access configuration period where the selected        two-step random access time-frequency resource is located or the        last RO in the time domain;    -   A mapping circle from the downlink beam where the selected        two-step random access time-frequency resource is located to the        random access resource, or the last RO in the time domain    -   An association period from the downlink beam where the selected        two-step random access time-frequency resource is located to the        random access resource, or the last RO in the time domain    -   An association pattern period from the downlink beam where the        selected two-step random access time-frequency resource is        located to the random access resource, or the last RO in the        time domain

b) Frequency domain position configuration of PUSCH time-frequencyresource:

i. Predefining or configuring the starting position of the frequencydomain, for example, the frequency domain starting position of thetwo-step random access PUSCH and/or M2 frequency domain units (orresource units of the two-step random access PUSCH) are after the Nfrequency domain units from one frequency domain position; wherein theone frequency domain position may be:

-   -   Bandwidth part (bwp); carrier, etc.    -   Frequency domain starting position of the selected two-step        random access RO;

Then, the UE determines that the frequency domain starting position ofthe two-step random access PUSCH corresponding to the selected RO may bethe first frequency domain unit after N (or N+x_id*M2; or N+x_id*M2*Y;or N+x_id*M2+delta; N+x_id*M2*Y+delta) frequency domain units; whereinx_id is the frequency domain index of the selected RO, or the RO index;or the selected preamble index (the preamble indices on the entire RO orthe available preamble indices corresponding to the two-step randomaccess, for example, the preamble indices on the entire RO is 0 to 63,and the available preamble indices for the two-step random access is 54to 63, and x_id may be 0˜9); a special N may be used as 0; wherein deltamay be expressed as a guard carrier, its purpose could be to avoidinter-carrier interference as much as possible;

c) Specifically, the two-step random access time-frequency resource andits corresponding two-step random access PUSCH resource have the samestarting position and the ending position of the frequency domain;

d) If there is only one available DMRS resource on one two-step randomaccess PUSCH, the PUSCH is mapped and selected in the preamble indexincreasing order; by the frequency domain priority or the time domainpriority; wherein M1*M2 needs to ensure to provide enough two-steprandom access PUSCH resources for the possible preambles on thecorresponding two-step random access time-frequency resource;

e) If there is more than one (e.g., W, e.g., W=12) available DMRSresources on one two-step random access PUSCH, then according to theincreasing order of the selected preamble indices, the DMRS resourcesare sequentially mapped to the increasing order of the DMRS resourceindices and to the increasing order of the available two-step randomaccess PUSCH resources (or sequentially mapped to the increasing orderof the available two-step random access PUSCH resource, and theincreasing order of DMRS resource indices); if one RO has 24 preamblesfor two-step random access, there are two PUSCHs, and there are 12 DMRSsavailable for each PUSCH, then the user who selects the preambles of0˜11 determines the first PUSCH, and selects the DMRSs according to theDMRSs of 0˜11 in the first PUSCH; if the user who selects the preamblesof 12˜23 determines the second PUSCH to be needed, and selects the DMRSsaccording to the DMRSs of 0˜11 on the second PUSCH; wherein the PUSCHresource increasing order available may be time domain priority orfrequency domain priority; wherein the DMRS resource indices may beexpressed as different (DMRS resource positions, RE mapping patterns,sequence indices, cyclic shift values, frequency domain OCCs, timedomain OCCs, or comb patterns, etc.).

f) The subcarrier spacing or waveform configuration of the two-steprandom access PUSCH is determined according to the subcarrier spacing orwaveform configuration in the uplink BWP configuration;

3. The control resource set and/or search space for monitoring feedbackmay be configured separately or pre-defined to be the same as thecontrol resource set and/or search space configuration for monitoringfeedback (or RMSI) of the four-step random access.

After the UE acquires the configuration information of the two-steprandom access resource, the UE may perform operations including at leastone of the following:

1. When the two-step random access time-frequency resource is sharedwith the four-step random access time-frequency resource, finding theavailable two-step random access time-frequency resource (i.e., RO)according to the selected downlink beam and mapping relationship, andthen selecting one preamble from the available two-step random accesspreamble set, and determining the corresponding two-step random accessPUSCH (including possible DMRS) by using the two-step random accessPUSCH configuration information;

2. When the two-step random access time-frequency resource is not sharedwith the four-step random access time-frequency resource,

-   -   If the two-step random access time-frequency resource is        configured separately, finding the available two-step random        access time-frequency resource (i.e., RO) according to the        selected downlink beam and mapping relationship, and then        selecting one preamble from the available two-step random access        preamble set, and determining the corresponding two-step random        access PUSCH (including possible DMRS) by using the two-step        random access PUSCH configuration information;    -   If the two-step random access time-frequency resource is        configured with respect to the four-step random access        time-frequency resource, finding the available four-step random        access time-frequency resource (i.e., RO) according to the        selected downlink beam and mapping relationship, and then,        through the configuration information, selecting the available        two-step random access time-frequency resource (i.e., RO); then        selecting one preamble in the two-step random access preamble        set, and then determining the corresponding two-step random        access PUSCH (including possible DMRS) by using the two-step        random access PUSCH configuration information.

After the resource is determined, the UE is ready for the preamble andthe message content included in the PUSCH to be sent, the coding method,etc.; after determining the transmission power after the power control,the message A (preamble and/or PUSCH) is sent out;

The UE monitors possible feedback information on the determined controlresource set and/or search space for monitoring feedback, and performssubsequent operations;

If the UE does not detect the correct feedback (or no feedback), the UEincreases a preamble transmission counter by one to perform the nexttransmission; or when the preamble transmission counter exceeds themaximum value, the UE reports the random access problem, or falls backto the four-step random access transmission.

The embodiment further provides a user equipment 700 for grant freeuplink transmission. The user equipment includes a memory 701 and aprocessor 702, the memory having stored thereon computer executableinstructions that, when executed by the processor, perform at least oneof the methods corresponding to the various embodiments of the presentdisclosure.

Specifically, for example, the processor may be configured to determine,according to configuration information for the grant free uplinktransmission received from a base station, a radio network temporaryidentifier GF-RNTI for the grant free uplink transmission and otherconfigurations to transmit an uplink signal; and monitor feedback fromthe base station in a downlink control channel by using the determinedGF-RNTI, and perform further operations according to the content of thefeedback.

The embodiment further provides a base station device 800 for grant freeuplink transmission. The base station device includes a memory 801 and aprocessor 802. The memory stores computer executable instructions that,when executed by the processor, perform at least one of the methodscorresponding to the various embodiments of the present disclosure.

Specifically, for example, the processor may be configured to transmit,to a user equipment side, configuration information for determining aradio network temporary identifier GF-RNTI for grant free uplinktransmission; and detect user's signal transmission on the configuredgrant free uplink transmission time-frequency resource, and performdownlink feedback on the successfully detected and decoded signaltransmission, wherein the downlink feedback uses the GF-RNTIcorresponding to the successfully detected and decoded signaltransmission.

The configuration information may include at least one of: a grant freeuplink transmission time-frequency resource set; a mapping relationshipbetween a grant free uplink transmission time-frequency resource and adownlink beam; a mapping relationship between at least one of a grantfree preamble, a DMRS or a multiple access signature resource and adownlink beam; a resource pool of GF-RNTI; a mapping relationshipbetween GF-RNTI and at least one of a time-frequency resource, apreamble, a DMRS, or a multiple access signature resource for grant freeuplink transmission; a control resource set for UE to monitor a grantfree uplink transmission feedback and/or a configuration of searchspace; the maximum number of transmissions of the grant free uplinktransmission; and the maximum transmission time of the grant free uplinktransmission.

The configuration information may also be used to determine at least oneof a grant free uplink transmission time-frequency resource, a grantfree preamble, a de-modulation reference signal DMRS, and a multipleaccess signature MAS.

The present disclosure also provides a computer readable medium havingstored thereon computer executable instructions that, when executed,perform any of the methods described in the embodiments of the presentdisclosure.

Specifically, for example, the processor may be configured to transmit,to a user equipment side, configuration information (the configurationinformation is the same as described above, and details are notdescribed herein); and detect user's signal transmission on theconfigured grant free uplink transmission time-frequency resource, andperform downlink feedback on the successfully detected and decodedsignal transmission, wherein the downlink feedback uses the GF-RNTIcorresponding to the successfully detected and decoded signaltransmission.

“User Equipment” or “UE” herein may refer to any terminal havingwireless communication capabilities, including but not limited to mobilephones, cellular telephones, smart phones or personal digital assistants(PDAs), portable computers, image capture devices such as digitalcameras, gaming devices, music storage and playback devices, and anyportable unit or terminal with wireless communication capabilities, orInternet facilities that allow wireless Internet access and browsing,etc.

The term “base station” (BS) as used herein may refer to an eNB, aneNodeB, a NodeB, or a base station transceiver (BTS) or gNB, etc.,depending on the technology and terminology used.

The “memory” herein may be of any type suitable for the technicalenvironment herein, and may be implemented using any suitable datastorage technology, including but not limited to semiconductor-basedmemory devices, magnetic memory devices and systems, optical memorydevices and systems, fixed memories and removable memories.

The processor herein may be of any type suitable for the technicalenvironment herein, including but not limited to one or more of ageneral purpose computer, a special purpose computer, a microprocessor,a digital signal processor DSP, and a multi-core processor architecturebased processor.

The above description is only the preferred embodiments of the presentdisclosure, and is not intended to limit the present disclosure. Anymodifications, equivalent substitutions, improvements, etc., which fallwithin the spirit and principle of the present disclosure, should beincluded in the scope of protection of the present disclosure.

Those skilled in the art will appreciate that the present disclosureincludes apparatuses that are directed to performing one or more of theoperations described herein. These apparatuses may be specially designedand manufactured for the required purposes, or may also include knowndevices in a general purpose computer. These apparatuses have computerprograms stored therein that are selectively activated or reconfigured.Such computer programs may be stored in a device (e.g., computer)readable medium or in any type of medium suitable for storing electronicinstructions and respectively coupled to a bus, including but notlimited to any type of disks (including floppy disks, hard disks,optical disks, CD-ROMs, and magneto-optical disks), ROM (Read-OnlyMemory), RAM (Random Access Memory), EPROM (Erasable ProgrammableRead-Only Memory), EEPROM (Electrically Erasable Programmable Read-OnlyMemory), flash memory, magnetic card or light card. That is, thereadable medium includes any medium that stores or transmits informationin a form capable of being readable by a device (e.g., a computer).

Those skilled in the art will appreciate that each block of thestructure diagrams and/or block diagrams and/or flow diagrams andcombinations of blocks in the structure diagrams and/or block diagramsand/or flow diagrams can be implemented by computer programinstructions. Those skilled in the art will appreciate that thesecomputer program instructions can be implemented by a general purposecomputer, a professional computer, or a processor of other programmabledata processing methods, such that the scheme specified in one or moreblocks of the structure diagrams and/or block diagrams and/or flowdiagrams disclosed in the present disclosure is executed by a computeror a processor of other programmable data processing methods.

Those skilled in the art can understand that steps, measures, andschemes in various operations, methods, procedures discussed in thepresent disclosure may be alternated, modified, combined, or deleted.Further, other steps, measures, and schemes in various operations,methods, procedures discussed in the present disclosure may also bealternated, modified, rearranged, decomposed, combined, or deleted.Further, the operations, methods, and procedures in the related arthaving the same steps, measures, and schemes as in the variousoperations, methods, and procedures disclosed in the present disclosuremay be alternated, changed, rearranged, decomposed, combined, ordeleted.

The above is only a part of the embodiments of the present disclosure,and it should be noted that those skilled in the art can also makeseveral improvements and modifications without departing from theprinciples of the present disclosure. The improvements and modificationsshould be considered as the scope of protection of the presentdisclosure.

What is claimed is:
 1. A method performed by a terminal for a 2-steprandom access procedure in a wireless communication, the methodcomprising: identifying whether physical random access channel (PRACH)occasions for a 4-step random access type is shared with a 2-step randomaccess type; and in case that the PRACH occasions for the 4-step randomaccess type is shared with the 2-step random access type, transmitting,to a base station, a message A including a preamble based on a firstconfiguration of PRACH occasions, wherein the first configuration ofPRACH occasions is common for the 4-step random access type and the2-step random access type, wherein, in case that the PRACH occasions forthe 4-step random access type is shared with the 2-step random accesstype, a preamble index of the preamble associated with a synchronizationsignal block (SSB) starts from an index which is determined based on astarting preamble index of preambles allocated for the 4-step randomaccess type associated with the SSB and a total number of preambles forthe 4-step random access type.
 2. The method of claim 1, furthercomprising: in case that the PRACH occasions for the 4-step randomaccess type is not shared with the 2-step random access type,transmitting, to the base station, a message A including a preamblebased on a second configuration of PRACH occasions, wherein the secondconfiguration of PRACH occasions is separately configured for the 2-steprandom access type.
 3. The method of claim 1, further comprising:receiving, from the base station, the first configuration of the PRACHoccasions.
 4. The method of claim 1, further comprising: receiving, fromthe base station, a message indicating whether the PRACH occasions forthe 4-step random access type is shared with the 2-step random accesstype.
 5. The method of claim 4, wherein the message further includesinformation indicating a subset of the PRACH occasions for the 4-steprandom access type shared with the 2-step random access type.
 6. Amethod performed by a base station for a 2-step random access procedurein a wireless communication, the method comprising: identifying whetherphysical random access channel (PRACH) occasions for a 4-step randomaccess type is shared with a 2-step random access type for a terminal;and in case that the PRACH occasions for the 4-step random access typeis shared with the 2-step random access type, receiving, from theterminal, a message A including a preamble based on a firstconfiguration of PRACH occasions, wherein the first configuration ofPRACH occasions is common for the 4-step random access type and the2-step random access type, wherein, in case that the PRACH occasions forthe 4-step random access type is shared with the 2-step random accesstype, a preamble index of the preamble associated with a synchronizationsignal block (SSB) starts from an index which is determined based on astarting preamble index of preambles allocated for the 4-step randomaccess type associated with the SSB and a total number of preambles forthe 4-step random access type.
 7. The method of claim 6, furthercomprising: in case that the PRACH occasions for the 4-step randomaccess type is not shared with the 2-step random access type, receiving,from the terminal, a message A including a preamble based on a secondconfiguration of PRACH occasions, wherein the second configuration ofPRACH occasions is separately configured for the 2-step random accesstype.
 8. The method of claim 6, further comprising: transmitting, to theterminal, the first configuration of the PRACH occasions.
 9. The methodof claim 6, further comprising: transmitting, to the terminal, a messageindicating whether the PRACH occasions for the 4-step random access typeis shared with the 2-step random access type.
 10. The method of claim 9,wherein the message further includes information indicating a subset ofthe PRACH occasions for the 4-step random access type shared with the2-step random access type.
 11. A terminal for a 2-step random accessprocedure in a wireless communication, the terminal comprising: atransceiver; and a controller coupled with the transceiver andconfigured to: identify whether physical random access channel (PRACH)occasions for a 4-step random access type is shared with a 2-step randomaccess type, and in case that the PRACH occasions for the 4-step randomaccess type is shared with the 2-step random access type, transmit, to abase station, a message A including a preamble based on a firstconfiguration of PRACH occasions, wherein the first configuration ofPRACH occasions is common for the 4-step random access type and the2-step random access type, wherein, in case that the PRACH occasions forthe 4-step random access type is shared with the 2-step random accesstype, a preamble index of the preamble associated with a synchronizationsignal block (SSB) starts from an index which is determined based on astarting preamble index of preambles allocated for the 4-step randomaccess type associated with the SSB and a total number of preambles forthe 4-step random access type.
 12. The terminal of claim 11, wherein thecontroller is further configured to: in case that the PRACH occasionsfor the 4-step random access type is not shared with the 2-step randomaccess type, transmit, to the base station, a message A including apreamble based on a second configuration of PRACH occasions, wherein thesecond configuration of PRACH occasions is separately configured for the2-step random access type.
 13. The terminal of claim 11, wherein thecontroller is further configured to: receive, from the base station, thefirst configuration of the PRACH occasions.
 14. The terminal of claim11, wherein the controller is further configured to: receiving, from thebase station, a message indicating whether the PRACH occasions for the4-step random access type is shared with the 2-step random access type.15. The terminal of claim 14, wherein the message further includesinformation indicating a subset of the PRACH occasions for the 4-steprandom access type shared with the 2-step random access type.
 16. A basestation for a 2-step random access procedure in a wirelesscommunication, the base station comprising: a transceiver; and acontroller coupled with the transceiver and configured to: identifywhether physical random access channel (PRACH) occasions for a 4-steprandom access type is shared with a 2-step random access type for aterminal, and in case that the PRACH occasions for the 4-step randomaccess type is shared with the 2-step random access type, receive, fromthe terminal, a message A including a preamble based on a firstconfiguration of PRACH occasions, wherein the first configuration ofPRACH occasions is common for the 4-step random access type and the2-step random access type, wherein, in case that the PRACH occasions forthe 4-step random access type is shared with the 2-step random accesstype, a preamble index of the preamble associated with a synchronizationsignal block (SSB) starts from an index which is determined based on astarting preamble index of preambles allocated for the 4-step randomaccess type associated with the SSB and a total number of preambles forthe 4-step random access type.
 17. The base station of claim 16, whereinthe controller is further configured to: in case that the PRACHoccasions for the 4-step random access type is not shared with the2-step random access type, receive, from the terminal, a message Aincluding a preamble based on a second configuration of PRACH occasions,wherein the second configuration of PRACH occasions is separatelyconfigured for the 2-step random access type.
 18. The base station ofclaim 16, wherein the controller is further configured to: transmit, tothe terminal, the first configuration of the PRACH occasions.
 19. Thebase station of claim 16, wherein the controller is further configuredto: transmit, to the terminal, a message indicating whether the PRACHoccasions for the 4-step random access type is shared with the 2-steprandom access type.
 20. The base station of claim 19, wherein themessage further includes information indicating a subset of the PRACHoccasions for the 4-step random access type shared with the 2-steprandom access type.